magnet charger


Posted on Feb 5, 2014

It is fairly safe to say that most Bulle clocks will need their magnet rejuvenated before they will run properly from the normal single 1. 5V cell. The first `real` magnet material was cobalt-chrome steel, in 1921 [ 1 ]. Prior to that, carbon steel was hardened by heating and quenching, and was the basis of most magnets used. Modern magnetic material commenced in around


magnet charger
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1932 with the invention of Al-Ni-Fe (aluminium, nickel, iron) which later became Alnico (aluminium, nickel, cobalt). Alnico was considered a quantum leap above earlier materials. It wasn`t until some time later that today`s really powerful magnetic materials became generally available. So-called rare-earth magnets were not produced commercially until the 1960s, with Samarium-Cobalt being the first offering. The most powerful magnets currently available are neodymium (neodymium-iron-boron, NdFeB) - these were invented in 1983, but were not readily available until some time later - well after Bulle clocks ceased production. [ 2 ] The way any magnet is `charged` is to subject it to an intense magnetic field - the more powerful the field, the better. It is not uncommon to simply wind a coil around the magnet and briefly connect it to a car battery, but this method is fraught with danger. Should the `contact` end of the wire become welded to the battery terminal, the coil and its supply wires will probably melt. The molten metal droplets can cause much damage to feet, arms, hands and the car`s paintwork, and the arc has a very high ultraviolet content and can damage your eyes. As a result (and also because I had almost everything I needed in my junkbox), I decided to put a charger together. Bear in mind that this will be an extremely expensive project if you have to purchase everything new. Even if you can get the bits from...




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